Preparation of Nb₃Al superconductor by powder metallurgy and effect of mechanical alloying on the phase formation

Adoption of powder-in-tube method to fabricate superconducting wire can realize a large application of Nb₃Al prepared by powder metallurgy. Powder metallurgy was used to synthesize Nb₃Al under various heat-treatment conditions, annealing temperature was varied from 700 to 1,000 °C and heating time was varied from 10 to 50 h. X-ray diffraction patterns reveal that a reaction between Nb and Al took place and formed NbAl₃ phase. Under current heat-treatment conditions (annealing temperature was varied from 700 to 1,000 °C and heating time was varied from 10 to 50 h), NbAl₃ was so stable that it did not further react with the unreacted Nb and was not sensitive to the heat-treatment condition. By mechanical alloying, adoption of high-energy ball milling significantly decreases particle size and enhances surface free energy, which promotes the formation of Nb₃Al phase. X-ray diffraction patterns indicate that relatively pure Nb₃Al phase was obtained under the same heat-treatment condition. Energy-dispersive X-ray analysis measurement demonstrates that the obtained samples were close to the right stoichiometry of A15 structure Nb₃Al.

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  • Accession Number: 01602085
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 24 2016 10:39AM